Multiple references to `lambda` when specifying `lambda` in `stat.glmnet_coefdiff`

[JamesYang007]

I would like to specify the lambda values to pass into glmnet by creating a wrapper function for stat.glmnet_coefdiff. However, I get the following error:

Error in glmnet::cv.glmnet(X, y, lambda = lambda, intercept = intercept,  :
  formal argument "lambda" matched by multiple actual arguments

Here is a simple reproducible code:

 library(knockoff)

 # dummy values
 n <- 30
 p <- 10
 X <- matrix(rnorm(n*p), nrow=n)
 y <- rnorm(n)

 # important part
 custom.stat <- function(X, X_k, y) {
     stat.glmnet_coefdiff(X, X_k, y, lambda=c(1,2))
 }
 out <- knockoff.filter(X, y, statistic=custom.stat)

I looked at the source code and I think the problem lies in cv_coeffs_glmnet line 162.
Specifically, if the caller specifies lambda, setting lambda at line 162 introduces a duplicate.